[Setup] Add a new function: run_make_install_config_for_nagios4()
[Setup] Load configuration files for nagios server.
[Setup] Add and use a new function: install_config_file_for_nagios()
[Assets] Add configure files for Nagios server.
[Assets] Add a configuration file to add monitored host for nagios.
[Setup] Load host configuration file.
[Setup] Add and use a new function: add_hosts_files_to_nagios_server()
[Creator] Add missing packages.
[Creator] Install missing software.
[Creator] Fix URL.

I understand to install the files.
But, in current structure, I don't understant how to do it...